feat(database): add engine.NewResources()

[jbrockopp]

Dependent on #869

This change adds a NewResources() function to the database agnostic engine{} type introduced in #868.

This function will be used to create all resource based engines for the configured database.

The logic for this function was copied from the duplicate code we already have in both supported drivers:

• postgres
• sqlite

[codecov]

Codecov Report

Merging #870 (14d3a0f) into main (e4bfa4e) will decrease coverage by 0.03%.
The diff coverage is 69.38%.

@@            Coverage Diff             @@
##             main     #870      +/-   ##
==========================================
- Coverage   72.09%   72.07%   -0.03%     
==========================================
  Files         311      312       +1     
  Lines       12953    13051      +98     
==========================================
+ Hits         9339     9407      +68     
- Misses       3168     3188      +20     
- Partials      446      456      +10     

Impacted Files	Coverage Δ
database/resource.go	69.38% <69.38%> (ø)